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my @a; $a[1] = undef; $a[2] = 123;
SV = PVAV(0x**6adf0) at 0x**99148 REFCNT = 1 ... REFCNT = 1 FLAGS = (IOK,pIOK) IV = 123
ARRAY @ 0x**8b9c0 ... +-------------+ | ... | +-------------+